In large skillet, stirring frequently, brown beef, onion and garlic over medium heat.,Stir in spaghetti sauce and water. Reduce heat.,Simmer 10 minutes.,Stir about 1 cup of sauce over mostaccioli mixture into a 13 x 9 x 2-inch baking dish.,Sprinkle with Mozzarella cheese and half cup Parmesan.,Top with 2 cups of the sauce.,Sprinkle with remaining Parmesan.,Bake at 350° for 30 minutes or until heated.,______,Easily frozen and reheated.